This series about petrographic analysis describes how petrography can be used to resolve performance problems and to characterize the raw materials so as to prevent poor performance. Petrography is done on the materials used in all components of highways: soil and rock cuts and fills, slopes, foundations, pavements, bridges, tunnels, and incidental construction. This recording outlines the necessary training for petrographers and broad examples of how petrography is used.
TRB conducted a webinar on Tuesday, April 25, 2017, from 2:00PM to 3:30PM ET that features research conducted by TRB’s Airport Cooperative Research Program (ACRP) that will assist airport operators in understanding measures to reduce lead emissions from general aviation aircraft operating on leaded gas, also known as AVGAS. While leaded fuel has been banned in almost all other transportation applications, it is still used today by piston engine aircraft. For over two decades, there have been efforts to find a replacement for leaded AVGAS. Until a replacement fuel is available for all aircraft, there may be practices that airports can adopt to reduce baseline lead emissions and/or exposure. These practices also may help mitigate lead emission impacts.